Halogen lamp



FIG. 1 is a front elevational view of a first embodiment of a halogen lamp showing my new design, the rear view being a mirror image thereof;

FIG. 2 is a right side elevational view thereof, the left side view being a mirror image thereof;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a bottom plan view thereof. 

The ornamental design for a halogen lamp, as shown and described. 